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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb379244ca9d3974df6d3a36b4dba6b87d34b9540494d4e7ab97dbe6f796074b' 
  AND token = 'KEINX9i4jKNbnIGVbN+Zb/SzCj0a+J2EFLyK8mMR5L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}